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微灌施用液體肥料如何選擇?

發布日期: 2017-03-16 作者:水溶肥設備 閱讀量:
導讀: 用于微灌施肥的肥料必須完全可溶,不含水不溶物且與灌溉水的相互作用小 ,不會引起灌溉水pH的劇烈變化,對灌溉系統腐蝕性小。另外,兩種或兩種以上肥料配施時,還要注意肥料之間的兼容性。雖然不同作物的耐肥性、使用...

 
    用于微灌施肥的肥料必須完全可溶,不含水不溶物且與灌溉水的相互作用小 ,不會引起灌溉水pH的劇烈變化,對灌溉系統腐蝕性小。另外,兩種或兩種以上肥料配施時,還要注意肥料之間的兼容性。雖然不同作物的耐肥性、使用的肥料和灌溉系統特性各有不同,為了避免肥液濃度過高傷到作物根系,灌溉水中的肥料濃度不應超過5%。因此在選擇水溶性肥料時,一方面要考慮肥料對灌溉的影響,另一方面還要考慮對作物的影響。
    通過微灌系統施用固體肥料時,須先將固體肥料溶解。肥料的水溶性受溫度影響很大,尤其是銨態氮肥和硝酸鉀。另外肥料混合可能會增加或者降低肥料的溶解性,為了確保肥料可以在微灌系統中不發性沉淀,應當先進行試驗,如果發生沉淀,則應當停止使用該肥料。
    若將有機肥用于微灌系統隨水施肥,必須解決兩個問題:一是有機肥必須液體化,二是要經過多級過濾。一般易漚腐、殘渣少的有機肥都適合于微灌施肥;含纖維素、木質素多的有機肥不宜于微灌系統。有些有機物料本身就是液體的,如酒精廠、味精廠的發酵產物廢液。     
但有些有機肥漚后含殘渣太多不宜作微灌肥料。辦要肥液中不存在這些可能導致微灌系統堵塞的顆粒,均可直接通過微灌施用。微灌施肥完成后保證15分鐘以上的清水沖洗,確保滴頭和過濾器無任何堵塞,滴頭也不會生長藻類、青苔等低等植物。

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